Joint for pavements



Sept. 7, 1937. W. E WHITE JOINT FOR PAVEMENTS `Filed Deo. 5, 1934Patented Sept. 7, 1937 UNITED STATES JOINT FOR` PAVEMENTS William E.White, Bethlehem, Pa., assignor to Kalman Steel Corporation, acorporation of Delaware Application December 5, 1934, Serial No. 756,054

17 Claims.

My invention relates to expansion joints for concrete pavement.

One object of the invention is to provide, an expansion'j'oint for aconcrete structure or pavement of such construction` that the surfaceofthe adjoining sections of the structure` will be retained'substantially in alignment under all conditions.

Another object of my invention is to provide an expansion jointstructure with offset portions of such construction that the sections`of the concrete structure on opposite sides thereof areV interlockedagainst vertical displacement.

The novel features of my invention will be more fully understood fromthe following description and claims taken with the drawing in whichFig. 1 is a top plan view of a section of a pavement structureillustrating my invention.

Fig. 2 is a sectional view of the structure taken along line 2 2 of Fig.1.

Fig. 3 is an enlarge-d view of a section of the structure taken alongline 3-3 of Fig. l.

Fig. 4 is a perspective view of a section of the strip.

Referring to the drawing, I5 designates a pave ment struct'ure providedVwith an expansion joint It embodying my invention. The structure I5comprises adjacent pavement sections which are shown in thedrawingasconcrete slabs `II and I8 having a strip I9 inserted in thejoint intermediate the slabs I'I and I8 to provide means to allow theexpansion of these slabs. The strip I3 may be of any well knowncompressible material, such as cork, nbre, asphaltum or the like.

The strip It, as shown, comprises substantially straight upper` andlower portions 20 and 2l respectively. The upper portion 2l) of thestrip extends a substantial distance below the surface of the pavement.The lower portion 2| of the strip is provided with a plurality `ofundercut recesses ,22, the walls of which converge toward the bottom ofthe strip and thereby provide dovetail slot adjacent the bottom thereof.

Extending laterally from the side of the strip adjacent the recesses 22are hollow projections 23 which in cross section are of substantiallythe same shape asthe recesses 22. Each of these projections 23, as shownin Fig. 4 of the drawing, comprises a metallic member 2liv having endflanges 25and 28, respectively, and a top portion 21, which form theends and top, respectively, of the-projection 23, and a member 28 of theshape, size and of the same material as the cut out portions of thestrip forming the recesses 2| which rforms the outer face of theprojection 23, and is shown substantially parallel to the strip proper.

In the construction of a pavement the strips I9 are positioned on theroad bed at the proper distance apart so that the necessary joints I6may be provided in the pavement and the concrete is poured to form slabssuch as II and I8 on each side of the joint. Due to` recesses 22 in thestrip I9 and the hollow projections 23 projections 29 are provided onthe slab I'I which con verge towards the bottom thereof andl recesses 30are provided on the slab I8- which` cooperates with the projections 29to provide interlocking means between theslabs AIl and I8 so as toretain the upper surfaces of the slabs I'I and I8 substantially` inalignment while permitting laterally slidable movement of the slabs withreference to each other.

The slabs I1 and I8 are preferably formed soI that the projections 29are on the near side of the joint,` and the recesses 30 are on the farside of the joint, the direction of traffic over the pavement shownbeing in the direction of the arrow so that'the slab I8 which is on thefar side of the joint will be supported partially by the projections 29on the slab I1 when the load is transmitted to said slab I8 by trafficpassing over the pavement.

From the foregoing it will be obvious to those skilled in the art that Ihave devised an improved expansion joint structure which is simple inconstruction and which effectively retains adjoining slabs in alignmentand at the same time permit lateral movement due to expansion andcontraction.

While I have shown my invention in but one form, it will be obvious tothose skilled in the art that it is not so limited but is susceptible ofvarious other changes and modifications without departing from thespirit thereof, and I desire therefore that onlyr such limitations shallbe placed thereupon as are imposed by the prior art or as arespecifically set forth in the appended claims.

I-Iaving thus described my invention what I claim as new and desire tosecure by Letters Patent is:

l.. An expansion joint for concrete pavement having separate slabs onopposite sides of the joint, interlocking means on said slabs to retainthe slabs against vertical displacement, said interlocking meanscomprising a plurality of dovetail recesses on one of said slabs havingthe side wall thereof converging towards the bottom of the slab and aplurality of projections on the other of said slabs having their sidesconverging towards the bottom of the slab cooperating with the dovetailrecesses.

2. An expansion joint for concrete pavement having separate slabs onopposite sides of the joint, interlocking means on said slabs adjacentthe edge thereof, said means comprising a dovetail recess in one of saidslabs, the entrance to said recess from the bottom of the slab beingnarrower than the interior of said recess and a projection on the otherslab of substantially the same contour as the dovetail recesscooperating with said recess to retain the upper surface of said slab inproper alignment.

3. An expansion joint for a concrete pavement having separate slabs onopposite sides of said joint, interlocking means on said slabs adjacentthe adjoining edges thereof, said means comprising a dovetail recess inone of said slabs having the side walls thereof converging towards thebottom of the slab and a projection on the other slab cooperating withsaid recess to retain the surface of said slabs in alignment whilepermitting lateral movement of the slabs relative to each other.

4. In combination with a concrete pavement, an expansion joint therefor,separate slabs on opposite sides of said joint, a compressible stripadjacent the vertical edges of said slabs, said strip comprising upperand lower portions within the same vertical plane and a plurality oflaterally extending projections adjacent the lower portion of saidstrip, each of said projections comprising converging side walls and awall connecting said side walls.

5. In combination with a concrete pavement, an expansion joint therefor,separate slabs on opposite sides of said joint, a compressible stripadjacent the vertical edges of said slabs, said strip comprising upperand lower portions within the same verticali plane, said lower portionhaving a plurality of undercut recesses therein, hollow laterallyextending projections on said strip adjacent said recesses, each of saidprojections comprising downwardly converging side walls and an end wallconnecting said side walls. l

6. In combination with a concrete pavement, an expansion joint therefor,separate slabs on opposite sides of said joint, a compressible stripadjacent the vertical edges of said slabs, said strip comprising upperand lower portions within the same vertical plane, said lower portionhaving a plurality of undercut recesses therein, hollow laterallyextending projections on said strip adjacent said recesses, each of saidprojections comprising downwardly converging side walls and an end wallconnecting said side walls, said end wall comprising a member ofsubstantially the size and shape of the undercut recesses.

7. A road strip for an expansion joint comprising a substantiallystraight longitudinal member of a compressible material having undercutrecesses in its lower portion, and laterally extending projections ofthe same general contour in cross section as the undercut recessesconnected to said strip adjacent said recesses, each of said projectionscomprising downwardly converging side members.

8. A road strip for an expansion joint comprising a substantiallystraight longitudinal member of a compressible material having undercutrecesses in its lower portion, and laterally extending projections ofthe same general contour in cross section as the undercut recessesconnected to the side of said strip adjacent said recesses, each of saidprojections comprising downwardly converging metallic side members and acompressible end member.

9. A road strip for an expansion joint comprising a substantiallystraight longitudinal member of a compressible material having undercutrecesses in its lower portion, and laterally extending projections ofthe same general contour in cross section as the undercut recessesconnected to the side of said strip adjacent said recesses, each of saidprojections comprising a flanged metallic member having downwardlyconverging flanges and a compressible member intermediate the flanges ofsaid metallic member.

10. A compressible parting strip for concrete pavements having a seriesof undercut recesses 'along its length adjacent the bottom thereof and aplurality of hollow projections, having downwardly converging sides ofsubstantially the same general contour in cross section as the undercutrecesses connected to one side of said strip adjacent said recesses.

11. An expansion joint for concrete pavement having separate slabs onopposite sides of the joint, interlocking means on said slabs adjacentthe edge thereof, said means comprising a recess in one of said slabs,the entrance to said recess from the bottom of the slab being narrowerthan the interior of said recess, and a projection on the other slabcooperating with said recess to retain the upper surface of said slab inproper alignment.

12. An expansion joint for a concrete pavement having separate slabs onopposite sides of said joint, interlocking means on said slabs adjacentthe adjoining edges thereof, said means comprising a recess in one ofsaid slabs having the side walls thereof spaced at a lesser degreeadjacent the bottom of the slab than they are spaced a distance from thebottom of the slab and a projection on the other slab cooperating withthe walls of said recess to retain the surface of said slabs inalignment while permitting lateral movement of the slabs relative toeach other.

13. In combination with a concrete pavement, anexpansion joint therefor,separate slabs on opposite sides of said joint, a road strip adjacentthe vertical edges of said slabs, said strip comprising upper and lowerportions within the same vertical plane and a plurality of laterallyextending projections adjacent the lower portion of said strip andextending substantially to the bottom thereof, each of said projectionscomprising side walls having the lower portion thereof spaced at alesser degree than the upper portion thereof and a wall connecting saidside walls.

141. A parting strip for concrete pavements having a series of undercutrecesses along its length adjacent the bottom thereof and a plurality ofhollow projections having sides extending substantially to the bottom ofthe strip and the lower portions of which are spaced at a lesser degreethan the upper portions thereof extending to the side of said stripadjacent said recesses.

15. A joint for a concrete pavement having separate slabs on oppositesides of said joint, means in said slabs adapted to retain the uppersurface of the slabs in proper alignment, said means comprising a recessin one of said slabs, having its sides spaced a greater degree towardsthe top of the recess than at the bottom of said recess and meansextending from the other slab into said recess and cooperating with thesides of said recess.

16. A road strip for an expansion joint comprising a longitudinal memberhaving undercut recesses in its lower portion, the entrance to saidrecesses from the bottom of said member being narrower than the interiorof said recesses, and laterally extending projections of substantiallythe same general contour in cross section as the undercut recessesconnected to said strip adjacent said recesses, the bottom of saidprojections lying in substantially the same horizontal plane as thebottom of the strip.

17. In combination with a concrete pavement, a joint therefor, slabs onopposite sides of said joint, a road strip intermediate said slabshaving associated with the other slab to retain the slabs 10 againstindependent vertical displacement.

WILLIAM E. WHITE.

